I can speed up your metabolism and make you shaky. I’d say try something else w/o all the bad stuff in it.

Yes, all of the above.
In small amounts, these are fine. One can of soda won’t kill you.
But if you drink a lot of it, that HFCS (High Fructose Corn Syrup) will play hell with your pancreas.
When you eat or drink anything, your pancreas begins to make insulin. This is to handle the blood sugars that are going to be created by the digestion of your food/drink. HFCS tends to spike your insulin production real high. Then once that sugar is taken care of (either turned to enery-glycogen-or stored as fat) it drops way off. Kind of a sugar crash after the sugar high. So many folks tend to drink more to pull out of that crash. Basically lots of sugary foods tend to over-tax the body, especially the pancreas. What it can’t use, it stores as fat, but this over-use of the pancreas has been anecdotally connected to diabetes.
I am not sure if they have established a hard connection to actual disease from the consumption of soda (lots of sugar), but at the very least, try to practice moderation.
Now, if you already have diabetes, then a super-sugary drink like Vault might not be allowed. Of course, it depends on what kind of diabetes you have, how you manage it, etc…

Ultimately, remember this is Yahoo Answers, and you are NOT talking to doctors here!!! If you want the absolute, find an MD who is a nutrition specialist.